Comparing mounted-mount points with fstab

Question

I took the sample script, below, off the net to check and validate mount points of system that is already up and running.

The problem: I want to compare existing mounted-mount points which are not commented out in the /etc/fstab and highlighting them if they are on.

Also, I would like to inquire if there is any alternative solution!

#!/bin/bash
while read ip;
do
    echo "connecting to $ip";
    ssh root@$ip "until mount | grep -w \"/mnt/data\" >/dev/null;
     do echo mounting \"/mnt/data\"; mount \"/mnt/data\"; sleep 1; done && 
     echo Mounted on $ip"
done < ips.txt

Answer 1

This appears to do the trick:

#!/bin/bash
mountpoints=( $(awk '$1 !~ /^#/ && $2 ~ /^[/]/ {print $2}' /etc/fstab) )
for mount in ${mountpoints[@]}; do
   if ! findmnt "$mount" &> /dev/null; then
      echo "$mount is declared in fstab but not mounted"
   fi
done

Answer 2

Stealing borrowing DopeGhoti's awk, you could use comm for this:

Filesystems that are mounted but not in /etc/fstab:

comm -23 <(mount|awk '{print $3}'|sort) <(awk '$1 !~ /^#/ && $2 ~ /^[/]/ {print $2}' /etc/fstab|sort)

Filesystems that are in /etc/fstab but not mounted:

comm -13 <(mount|awk '{print $3}'|sort) <(awk '$1 !~ /^#/ && $2 ~ /^[/]/ {print $2}' /etc/fstab|sort)